Arc-lamp.



1. L. DINSMOOR.

ARC LAMP.

APrLlcATloN FILED ocr.e.1911.

1,143,168. v Patented June 15, 1915.

. B y F' A v v l [fw/nays THE` NoRRls PETERS CO4. PHOTO-LITHO.. wAsHlNaroN. D. 1

I. L; nINsIvIoOII.-

ARC LAMP.

APPLICATION FILED ocT. 6, IsII.

, 1,143,108. Patented June 15, 1915.

4 SHEETS-SHEET 2- I i I. i f. v

" i [NVE/WOR -W/ TAL/55555 J. L. DINSMOR.

v ARC LAMP.

APPLICATION FILED 001.6, 19II.

4 SHEETS-SHEET s'.

Patented June 15, 1915.

[NVE/WOR W J T/VESSES maw w .nu fn .n Z Z .mv Ja, /,./H 7%/ V.. MB

THE NORRIS PETERS CO.. PHGTO-LITHO.. WASHINGTON, D. C.

I'. L. DINSIVIOOR. ARC LAMP.

APPLICATION FILED OCT. 6, 1911.

1,143, 108. Patented June 15, 1915.

4 SHEETS-SHEET 4.

IIIIIIIIIIIIIIIIIIIIIIIII m I X L -UFIIIIIIIIIIIIII Immun-.-

WIM/55555.- [NVE/WOR I C W JLZ .171172571z'007j THE NORRIS PETERS Cb.. PHOTD-LITHO.. WASHINGTONv D. C.

JOHN L. viiINsivioon, or NEW YORK, N. Y.

AEC-Lann` Specification of Letters '.Patent. Patented June 15, 1915.

Application led October 6, 1911. Serial 110.653,11.

To all 'whom t may concern:

Be it known that I, Joi-iN L. DiNsMooR, a citizen of the United States, residing in the city of vNew York, borough of Manhattan, county and State ofNew `York, have invented a certain new and useful Arc- Lamp, of which'` the following is a specication. n

vThis invention is an arc lamp of that kind wherein the carbons are positioned in downwardly inclined relation to each other so that the iiow of current through the carbons, when the latter are separated at their lower ends, will result in the establishment of an arc between said carbons.

rllhe means for controlling and feedingy the carbons inthe lamp 'of the present invention are simple in lconstruction and economical of manufacture for the reasons,V mainly, that complicated and expensive parts are dispensed with, such as devices, sometimes termed slipper' devicesffor effecting a lateral separation ofthe carbons when striking the arc, a shunt magnet, dash pot, and one or more'springs.

` bons are moved apart at their points for a sufficient distance to establish the arc gap and thus strike the arc. In my lamp, the carbons are guided for movement in predeteimined paths so as to be movable only in the direction of their length, no lateral movementr of theicarbons -relative to each other being required in the operations of striking or restoring the arc. Accordingly,

the carbons are movable in two directions, first in an upward direction lengthwise thereof for striking the arc, and, second,

in a downward direction, under the in luence of gravity and in the direction of their length, soY as to compensate for the Y burning away of thecarbon material and to restore the arc. .n l v My improved lamp employs. a single series coil or solenoid, the plunger of which carries a member positioned forcoperation with a double clutch, the parts of whichclutch control the slip of chains or flexible connections with reference to certain guide ed for movement relative to each other when the lclutches are actuated by the movement of the plunger. Theflexible connections which run through the kpivoted tubes are each attached at one end to a carbon carrier, the other end being anchored at a fixed point,but intermediatethe ends of the ieXible connections the latter run loosely over a pulley on a slidable cross head which is guided in the lamp frame, said cross head serving, mainly, the purposes of a counterweight in automatically taking up the slack in the flexible connections.

Otherl features'of the invention, and the advantages thereof, will appear in the course ofthe following description taken in connection with the drawings.

In the accompanying drawings, I have illustrated one practical embodiment of the invention, but the construction shown therein is to be understood as illustrative, only, md not as rdefining the limits of the invenion.

Figure 1 is a side elevation, with parts in section, illustrating a regulating mechanism for iaming arc lamps embodying this invention. Fig. 2 is an elevation looking toward the right in Fig. 1, certain of the parts being omit-ted. Fig. 3 is an enlarged view, partly in elevation and partly in section, of the regulating mechanism at the top part of thev lamp. Fig. 4 is an `enlarged view, partly in section and partly in eleva-- tion, of the parts at the lower end of the lamp, .the carbons being shown in their separated positions. Fig. 5 is a view somewhat siinilar to .F ig. 3 illustrating the parts of the regulating mechanism in positions for separating...the carbons to strike the arc when the solenoid plunger is drawn upwardly. Fig. 6 is a cross section on the line G-G of Fig. 3. Fig. 7 is a detail sectional view illustrating an automatic switch mechanism by fwhich a compensating or substitutional resistance is` included in the line circuit when the lamp is out of service. Fig.' Y

sociated with the pivoted tubes. Fig. 9 is a diagram of the lamp circuit. Fig. 10 is an enlarged sectional view illustrating in detail one of the bent tubular members, the clutch carried thereby, and the flexible carbon-supporting member in the form of a link chain, the latter having running engagement with the bent tubular member and adapted to be made fast therewith by gripping action of the clutch. Fig. 11 is a detail view looking at the parts from the left in Fig. 10.

The lamp frame embodies a top plate or member 5, a bottom plate 6, (sometimes termed an econoinizer two pairs of rods 7, 8 attached rigidly, in any suitable way, to the top plate and the bottom plate, another plate 9 positioned intermediate the'top plate and the bottom plate, and guide rods 10 attached to the top plate and the intermediate plate 9. The top plate 5 serves as a support for a hood or easing 11, and to this plate is rigidly secured upstanding arms 12 to which is connected a bail 13 by which the entire lamp structure is suspended.

Secured rigidly to the top plate is a supporting bracket 14, upon which is mounted a series coil 15, said series coil being the only coil employed in the lamp, for the reason that the usual shunt coil is omitted. lVithin the series coil operates a core or plunger 16, the saine passing downwardly through the coil and through an opening 17 provided in the supporting bracket 1li. r1`he top plate 5 is provided with a central slot or opening 1S and with other slots or openings 19, said plate having upstanding flanges or lugs 2O at the respective sides of slot or opening 1S. r1`lie solenoid plunger is provided with an upwardly extending rod 21, the upper part of which is threaded as at 22. Said plunger is provided, also, with a depending rod 23 which passes downwardly through'slot 18 in top plate 5, the lower part of said rod 23 being threaded. On this lower threaded part of rod 23 is screwed a cross member 24, the same being shown as a plate, the respective parts of which are bent at an angle to each other, and said ends of the plate being forked or slotted so as to loosely embrace certain guide tubes 25, 26 and clutches 27, 28.. Each tube 25, 2G is bent or looped upon itself in the form shown more particularly in Figs. 1, 3 and 5 of the drawings, so as to produce a tube having one arm longer than the other. Said tubes are positioned reversely to each other, the long arms of the tubes passing through the slot 18, whereas the short arms of the tube are positioned for operation within slots 19 of the top plate. Each tube is provided with oli'standing lugs or ears 29 which fit between flanges Y2O of plate 5, and through said lugs or ears and the flanges passes a pivot pin 30, whereby the tube is pivotally supported upon the top plate for swinging movement in the slots 13, 19 therei,14e,ios

of. The looped part of each tube extends above the top plate and into the space of hood 11, whereas the arms of the tube pass through the slots 18, 19 so as to extend below the slotted. upper part of the top plate. The long arm of each tube is provided with a slot 31 and around each tube is secured or clamped a sleeve or band 32. As shown in Figs. 1, 3, 5 and 9, the short arm of each pivoted tube is provided with a stop collar 29a, the latter being of such diameter that it cannot pass through slot 19 in the top plate. `When the tube occupies the idle position shown in Fig. 1, collar 29fl rests upon top plate 5 and thus limits the movement of the tube in one direction. Each clutch 27 or 28 consists of a curved plate which is provided on one edge with serrations or teeth 33. The clutch 27 `is pivoted at its lower end to a sleeve 32 by means of a pin 3ll, whereby said clutch 27 is pivotally attaclied to tube 25. The other clutch 28 is pivoted by a pin 35 to the sleeve 32 of tube 2G so that said clutch 2S is pivoted to and carried by tube 2G, as clearly shown.

The member 241 on the depending rod 23 of the .solenoid plunger engages the clutches 27, 2S, for the purpose of moving them inwardly toward the slots 31 in tubes 25, 2G, and said end portions of member 2li act, also, upon the tubes 25, 2G in a manner to move them on their pivots 30. The movement of the clutches and of the pivoted tubes by member 24 is effected by the upward movement of plunger 1G due to the action of the series coil thereon, but when the plunger and member 24- are lowered, tubes 25, 2G swing on their pivots by the action of gravity, the larger heavy arms of the tubes swinging outwardly and away from each other, and the swinging movement of the tubes being ariested by the contact of collars 29n with top plate 5, see Figs. 1 and 3. Then the clutch actuator 211 is lowered, the clutches 27, 2S swing on their pivots by gravity, said clutches swinging toward each other and said clutches being movable with respect to the slotted parts of the pivoted tubes.

36, 37 are carbon holders, each consisting of a plate having forked end portions 38. Carbon holder 36 is fitted slidably to rods 7 of the lamp frame at one side thereof, whereas carbon holder 37 is :(itted slidably to the other rods 8 at the opposite side of the lamp frame, as shown more particularly in Fig. G. whereby the carbon holders are retained in position by the rods of the lamp frame and they are free to slide upon said rods. Each carbon holder is provided with suitable means for the attachment of the carbon thereto, said carbons being indicated at A, B, and positioned in downwardly converging relation.

39 designates a cross head, the end portions of which are slotted at Ll0, sce Fig. G.

Said cross head is positionedfor movement between top plate and intermediate plate 9 of the lamp frame, and the slotted parts of said cross head are fitted slidably on 5 the guide rods V10, wherebyy said cross headv 39 is retained in position within the lamp frame, andthe movement of said cross head is directed by the rods 10. The crossV head is provided with two pulleys 41, 42,' and cross head 39, thence-the flexible connection passes upwardly to and through pivoted tube 26, and thence the flexible yconnection 43 passes downwardly andyis attachedy to carbon holder 37. y The other flexible conneetion 44 is anchored at a fixed point 46 on the top plate 5, from whence said connection passes downwardly 5to and beneath pulley 742 upon the sliding cross head, from thence said connection 44 passesupwardly to ,and through pivoted tube 25, and thence downwardly tothe carbon'holder 36 toV which it 3Q is ixedly secured. The sliding cross vhead 39 and the pulleys 41,7V 42 'thereon are of suflici'ent weight ,tot lower. the cross head with respect to thel guide'tubes 10, for the purpose of automatically [taking up. vthe thus keeping said lflexible connections frelatively taut. through the tubes 25, 26in such relation to theclutches 27, 28 that-fthe toothed faces ofV 54@ the clutches will engage lwith the links of the chainsgin va mannerftov preclude sliding movementy of the cha-ins throughthe tubes when the clutches ,are forced through the yslotted parts 'of the tubesy by theaction of r4?! member 24 which isA carredby the solenoid ,-plunger. l Y -v Y c.

Bottom plate 6 of thelamp frame is provided with acentral slot 47 throughwhich q pass the lower ends of carbons A, B; `Said 50g bottom plate is shown as having a depend, ing 'member 48 providedwith a recess 49,

' said recessed member constituting the, part n `ordinarily?designated Y as ,anrleconomizen Y Upon thetop of plate 6'isa plate50 kcom- 551 posed of asbestos or other heat-resistingmaterial, said plate 50,2being provided "with apertures 51 for they passage of the carbons'. v'The upwardly Vextending rod 21lyof the solenoid plunger passes a suitable ydistance above the solenoid coil, vand on .this rod are" nuts52, 53. Therod passes loosely vthroughV apertures 54 provided centrally'in a series of weights55 56,` 5 7. rlhe weights are cupshape yso asto t telescopically together, said weights constituting a mechanical reslack in the flexible chains or cables 43, 44,

The `chains or.V cables Vpass sistance when the solenoid plunger moves` upwardly' to predetermined( positions within the 'coil 15'. o Each weight rests upon the top of the solenoid, and when the plunger moves upwardly to a certain position, the nut 52 engages with weight 55 so as to lift it. A

continuedupward movement of the plunger and the weight 55 Vthereof brings said weight 55 into contact'with weight 56 so thaty the Vweights 55,V 5 6 will bei imposed upon the plunger -to act as a resistance to the upward movement thereof, ybut a istill further upwardmovement ofthe plunger acts to bring the weight56 into contact with the weight 57, thus imposing all the weights upon the plunger When the latter is moved to an extreme upward position within the coil, substantially as shown in Fig. 5.

The intermediate plate 9 of the lamp frame supports the blow coilsy 58, the same being securedfrigidly to the under side of Y saidplate at lthe respective end portions thereof. The blow coils are positioned at the lower part of the lamp and in such relation to the carbonsthat they will` exert a magnetic iniuence 'upon the arc, for the purpose of properlyy directing the aro .between the carbons, the Laction of' said blow coils being similar to the blow coilsvus'ed in other lampsof the flaming are type.

59 designates a resistance coil which' 1s supported on aspool 60 of porcelain or other material, through whichV spool passes a nietallicy rod or conductor 61. One end of this conductor is provided with a clip 62 to which is attached an end portionf59a of the resist-r ance coil 59. The lower end of the rod or conductor 61 isconnectedto the blow coils 58. The coil 59 constitutes a line resistance and thiscoil is embraced by anadjustable vband 63,.to' which is secured a conductor 64 which leads to one of the lamp terminals 65; The upper'part of the conductorl is provided with a clip" 66 to which is connected the lower end of another resistance coil 67, saidfresist-V ance coil being herein referred to as a sub-V.

sti'tutional or compensating resistance. The resistance coil 67 is connected at. its upper part to conductor 68 Vwhich leads to one contact 69 of a pair of spring contacts, the other contact of said pairof spring contacts beingindicatedat 70. Said contact 70 is connected by a conductor 71 with -theV series lie coil"15 or lwith the incoming lead 72 of the lamp, said'lead 7 2 being connected Awith the positive lamp v terminal 7 3. The solenoid izo plunger 16 is provided with an arm 7 4,'and

extending upwardlyfrom this arm 74 isa tapering member 75 composed of insulating material, said arm 74 landthe member 75- bemg so positioned relative to the spring.v

contacts'69, 70 that thefupward movement of the plunger 16 :operates to position the insulated member 75 between the contacts 69, 70, for the purposey of separating them ,Y

and interruptingthe flow of current, through the conductor 71, the two contacts, and the compensating resistance 67 when the current liows through carbons A, B, in the operation of the lamp.

The circuit connections are as follows: From the positive post 73 the conductor 72 leads to the series coil 15; from this coil'eX- tends a conductor 74 to the carbon B; the current flows from carbon B into carbon A, thence by a conductor 75 to the blow coils 58 which are in series with the lamp circuit; from one coil 58 the current flows into rod 61 and thence through a part of the resistance coil 59, and from thence the current flows through the band 63 and conductor 64 to the negative binding post 65 of the lamp. lVhen no current is flowing through the carbons of the lamp, the solenoid is deenergized, whereupon the plunger 16 drops to a lowered position and the arm 74 is pulled downwardly so as to withdraw the insulated member 75 from engagement with the spring contacts 69, 70, whereupon the current flows from the positive post 73 through the conductor 72, the conductor 7l, contact 70 to contact 69, conductor 68, resistance coil 67, connection 66, rod 6l, connection 59, a part of the line resistance coil 59, band 63 and conductor 64: to the negative post 65. Vhen the lamp is out of service, the current flows around the series coil 15, and through the compensating resistance coil 67 and a part of the line resistance coil 59 to the negative post. Upon switching the current into the lamp, it divides, part of it flowing through coil 67 but the remainder ows through series coil 15, carbon B to carbon A, the blow coils, line resistance coil 59 and conductor 64 to the negative post. The series coil being energized, plunger 16 is lifted a certain distance, thus elevating clutch actuator 24, the result of which is, first, to move the clutches 27, 28 into fixed engagement with chains or cables 43, 1f-l, respectively, and, second, to so act upon the pivoted tubes 25, 26, as to move the said tubes upon their pivots 30.` The chains or cables are thus held against movement within the tubes, and the tubes themselves are shifted in position to draw upwardly on the carbon carriers 36, 37, said tubes having the action of bell cranks on the chains or cables for the purpose of simultaneously lifting the carbon carriers, whereby the two carbons are moved for equal distances and in the direction of their length, the result of which is to separate the carbons at their lower ends and strike the are without, however, moving the carbons laterally with respect to each other. The plunger is held in a raised position by the energy of the solenoid so that the regulating mechanism operates to keep the carbons separated, but as the carbons burn away at their lower ends, the strength of the current in the solenoid decreases owing to the increased resistance across the arc, whereupon the plunger is lowered slightly by gravity, thus moving clutch actuator 24 and releasing the clutches 27, 28 sufficiently for the chains to slip through the pivoted tubes. The slipping of the chains through the tubes takes place without appreciably affecting the positions of the pivoted tubes so that the arc continues to burn during the operation of feeding the carbons. The feed of the carbons is effected by my regulating means in such manner that the steadiness of the arc is not perceptibly affected, such operation of feeding the carbons being termed a sneak feed.

The telescopic weights adapted to be imposed successively upon the solenoid plunger enables me to dispense with the shunt magnet ordinarily employed. These weights are particularly useful in flaming arc lamps, two lamps being used in series. The weights act to compensate for variations in the arc voltage of each lamp. lVhen the two lamps are burning in series, one lamp has a tendency during the feed of the carbons to establish a higher are voltage than exists in the other of the two said lamps, as a result of which the plunger of kone lamp has a tendency to raise to a position within the solenoid above the limit of its upward normal movement. Under such circumstances, the upward movement of the plunger above the normal lifts the nut 52 into contact with weight 55, thus imposing the weight upon the plunger. Should this weight not be suflicient to arrest the upward travel of the plunger and thus compensate for the higher arc voltage in the lamp, then the other weights 56, 57 are imposed successively upon the solenoid by the upward movement thereof, the extreme upward movement of the plunger lifting all the weights as shown in Fig. 5. The weights act to prevent the plunger from being lifted too high with reference to the coil and the other elements of the regulating mechanism.

When the lamp is in service, the plunger is held in a raised position so that the niember 75 is between the contacts 69, 70, thereby Vbreakingthe circuit through coil 67 and conguides for the flexible connections 43,44 running from the yanchor points 45, 46, through the counterweightor cross head 39,

and thence to the carbon carriers; and when the clutches are gripped to the flexible connections by the action of the clutch actuator, due to the upward movement of the solenoid plunger, said pivoted tubes perform the functions, also, ofbell-cranklevers in lifting the carbon carriers, for thegreasonpthat 'i each pivoted tubeiacts to exert an upward pull upon that 'length'of the `chain-'between the carbon carrier and theclutch. The other length of each chain, between the clutchfand'. the fixed anchor pointis engaged by a pul-v ley of the crossihead, the weight of the "latter being imposed normally upon the two chains l or cables 44, 45, forl the purpose of taking up the slack, thereby keeping the chains vor cables ina taut condition.` Y i My regulator maybe used 1n connection Vwith llamps which are supplied with alternating current or with directV current. The substitutional resistance coil 67'here1n described 1s useful particularly 1n lamps supplied with direct current but when'the lamp lardirectingI members.` These tubularvdiord is to be used on alternating current, itis pre- Y ferred to usea choke.7 coil of a well known form .in heu of they substitutional resistance "LThe parts of they regulating ymechanism areso constructed` and arranged that the lamp can be. transported, oreven inverted, withoutV liability of' the chains lbecoming entangled/or any of the lparts getting out of er.k c t rFrom the foregoing description taken in connectionwith y the .drawings it will be noted that the bent tubes 25, 26, serve the function, mainly, ofl directing members fory the chains or cables'43,`44, thev latter yserving the purpose offlexible members to connect the electrode carriers 36, 37', with said tuburecting members'arepivoted Vfor movement in directions to raise .or lower the electrode yiso carriers through 1the medium of the flexible -members,'the latter havingsliding engagement with the `tubular directing members. Asf stated,the'elutches are pivoted on the tubular directing members to partake of the pivotal movement thereof, but said clutches are;y movable, also, into gripping engagement withfthe.flexiblemembers for the purpose ofA precludingV the flexible members from sliding' relative tothe directingmembers and of-partakin ofthe pivotalmov'ement thereof, where y the clutches andV tubular directing members coperate `to raise the electrodes or to lower the same. Y Having .thus fullydescribed the .inven tion, what I claim 'asnew,y ndV desire to secure by Letters Patent is l. In an arc lamp, the combination with a plurality of"`carbon holders limited to movement in inclined paths, a plurality of tubular directing members each pivoted intermediate its ends for movement on a horizontal axis, said tubular members being slotted, a pluralityT of flexible members jeach having sliding frictional contact with the tubular member and being attached to one lof said carbon holders, a plurality of clutches carried by the tubular members and positioned for operation in the slots thereof so as to have gripping engagement with said flexible members, and current operated means cooperating with said clutches and with said tubular directing members for actuatingsaid clutches simultaneously and for imparting conjoint movement to the tubular directing members, the clutchesand the iiexibl'e members. Y

. 2. ln an arc lamp, the combination with a plurality of carbon holders limited to movement in linclined paths, of a plurality'of tubular slotted directing members each pivoted intermediate the ends thereof, a pluralitylof flexible members each having sliding frictio'nal contact with one of said'tubular members and attached to one of said: lcarbon holders, a plurality of clutches each carried by one of the tubular'directing members and positioned in the slots of said members forY directgripping engagement ywith one of said flexible members, said clutches being movable with the tubular directing members and being pivoted for movement Vraise orlower said electrodes, means for gripping and` releasing,` said flexible members so that -the latter are held fast to the directing members 'or' arefree to slide there- .through under ytheweight -of the electrodes,

Yand an actuator for the gripping and releasingmeansY and for the. tubular directing members. 1

4. -Means for Yregulating the electrodes of an arc lamp embodying iexible .members having means for supporting the electrodes, a plurality vof tubular. directing members within which the flexibleA members are free to slide, aplurality of clutches each pivoted to one directing member` and positioned for liov gripping engagement with the flexible member therein, and an electrically-operated member movable into contact with said clutches for gripping the latter upon the flexible members, said electrically operated member operating to impart movement simultaneously to the tubular directing members for raising or lowering the electrodes,

5. In an arc lamp, the combination with a plurality of electrode carriers, of a plurality of tubular slotted directing members each pivoted intermediate the ends thereof, a plurality of flexible members attached to said electrode carriers, each flexible member being provided with a loop having sliding frictionalA Contact with one of said tubular directing members, means for taking up slack in said flexible members, a plurality of clutches each carried by one of said tubular directing members and positioned for movement in the slot thereof so as to have gripping engagement with a flexible member, and a current operated actuator positioned for direct contact with said clutches so as to actuate the clutches simultaneously in gripping and releasing the flexible members, said current operated actuator acting to also impart movement simultaneously to the tubular directing members.

G. In an arc lamp, the combination with a plurality of electrode carriers, of a plurality of curved slotted directing members each pivoted intermediate the ends thereof, flexible members attached to said electrode carriers, said flexible members being positioned in sliding frictional contact with said tubular directing members, means for taking up slack in said flexible members, a plurality of clutches each pivoted to one of said tubular directing members for operation within the slot thereof so as to have gripping engagement with the flexible member slidable therein, said clutches being free to fall by gravity away from the flexible members, and actuating means in slidable relation to said clutches and the directing members for imparting pivotal movement simultaneously to the latter and for simultaneously operating said clutches to grip the flexible members.

7. In an arc lamp, the combination with electrode carriers, of a plurality of tubular directing members pivoted for movement in directions to raise or lower said carriers, a plurality of flexible members fitted slidably in said tubular directing members, each flexible member being anchored at one endand attached at its other end to one electrode carrier, means for taking up slack in said flexible members, a plurality of clutch devices each pivoted to one tubular directing member and positioned for gripping engagement with one of the flexible members for restraining the latter from sliding movement relative to said directing member, and an electrically operated actuator coperating with said clutch devices and with said tubular directing members.

8. In an arc lamp, the combination with electrode carriers, of a plurality of bent tubular directing members positioned reversely to each other and pivoted separately for movement in directions to raise or lower said carriers, flexible members tted in said tubular directing members for sliding movement therein, said fiexible'members being connected to said carriers, clutches each pivoted to one of said directing members for gripping engagement with said flexible member therein, a solenoid, a plunger, and a clutch actuator movable with said plunger and positioned for cooperation with said clutches and with said tubular directing members.

9. In an arc lamp, the combination with electrode carriers slidable in inclined paths, of a plurality of tubular slotted directing members each pivoted intermediate the ends thereof for movement in two directions, a plurality of flexible members each having a loop in sliding frictional contact with one of said directing members, said flexible members being connected with said electrode carriers, separate clutches carried by said directing members and positioned for operation in the slots thereof so as to have direct gripping engagement with said flexible members, each clutch being movable on an axis separate from the axis of movement of the directing member by which the clutch is carried, means for taking up slack in the flexible members, and an electrically operated actuator coperating both with the directing members and with the clutches, said actuator operating to impart movement simultaneously to the clutches and to impart pivotal movement positively in one direction to said directing members simultaneously, the pivotal movement of said directing members in the other of said directions being due to the gravity of the electrodes.

l0. In an arc lamp, the combination with a plurality of electrode carriers, of a plurality of tubular slotted direction members each pivoted intermediate the ends thereof, a plurality of flexible members each having a loop in slidable frictional contact with one direction member, said flexible members being attached to said electrode carriers, a plurality of clutches each positioned in the slots of saiddirection members to frictionally grip one flexible member between itself and one direction member, means for taking up slack in said flexible members, electrically operated means the movable part of which is free from direct mechanical connection with said direction members, and means actuated by said movable part and col 5 members When striking the are.

- 1,148,108 Y f Q17 operating With the clutches and the direcname to this specification in the presence of tion members for impartingpivotal movetwo subscribing Witnesses. ment first to the Clutches and thereafter im- JOHN L. DINSMOOR. parting lpivotal movement to the direction Witnesses: 1

H. I. BERNHARD,

In testimony whereof I have signed my J F. MOTHERSHEAD.

yCopies! of this patent my be obtained for ve cents each, by addressingthe Commissioner of Patents,

f Washington, D. C." 

